545221220111 has 4 divisors (see below), whose sum is σ = 554462257800. Its totient is φ = 535980182424.

The previous prime is 545221220059. The next prime is 545221220123. The reversal of 545221220111 is 111022122545.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111022122545 = 5 ⋅22204424509.

It is a cyclic number.

It is not a de Polignac number, because 545221220111 - 2¹⁰ = 545221219087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545221220191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4620518756 + ... + 4620518873.

It is an arithmetic number, because the mean of its divisors is an integer number (138615564450).

Almost surely, 2^545221220111 is an apocalyptic number.

545221220111 is a deficient number, since it is larger than the sum of its proper divisors (9241037689).

545221220111 is an equidigital number, since it uses as much as digits as its factorization.

545221220111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9241037688.

The product of its (nonzero) digits is 1600, while the sum is 26.

Adding to 545221220111 its reverse (111022122545), we get a palindrome (656243342656).

The spelling of 545221220111 in words is "five hundred forty-five billion, two hundred twenty-one million, two hundred twenty thousand, one hundred eleven".